Car plate recognition by whole 2-D image

摘要

This study did not extract the characters in the car plate separately. Instead, a whole 2-D car plate was processed as an entity; subsequently, it was recognized. In this study a ring-to-line mapping technique is used to map a car plate image to several straight-line signals. Moreover, the vector magnitude invariant transform technique is used to transfer a car plate signal to an invariant vector magnitude for comparison, a procedure that can solve the image-rotation problem. Various vertical magnitude strips are generated to manage the image-shifting problem. The algorithm developed in this study can precisely identify car plate images.